In the LC gauge the LC Hamiltonian with massive quarks reads [1]}
\(H_{0} \equiv \int d x^{-} d^{2} \mathbf {x}\left[\frac{1}{2}\left(\partial _{i} A_{j}^{a}\right)^{2}+ \psi _{+}^{\dagger } \frac{-\partial _{i} \partial _{i}+m^2}{i\partial ^{+}} \psi _{+}\right],\) 
